Re: MySQL 5.5 Slow performance to insert
- Date: Mon, 27 Jul 2015 17:10:15 +0200 (CEST)
- From: Johan De Meersman <vegivamp@xxxxxxxxx>
- Subject: Re: MySQL 5.5 Slow performance to insert
----- Original Message -----
> From: "Camilo Vieira" <camilo.vieira@xxxxxxxxx>
> Subject: Re: MySQL 5.5 Slow performance to insert
> $ ./mysqltuner.pl --user root --pass abril@123
Thank you for that password :-) I don't particularly like MySQLtuner myself, it makes assumptions about your workload that are, imo, false more often than not. Anyway...
> [!!] Total fragmented tables: 284
*shrug* Small issue on modern storage, pretty much no issue on solid state.
> [!!] Key buffer used: 18.2% (3M used / 16M cache)
*shrug* You could shrink that if you have no MyISAM at all, but it's a neglectable amount of memory.
> [!!] Query cache is disabled
Which is pretty much irrelevant for an insert workload :-)
> [!!] Table cache hit rate: 1% (400 open / 30K opened)
That might be worth growing. Exact numbers are hard to point at, use munin or similar to figure out the growth rate of opened_tables.
> [!!] InnoDB buffer pool / data size: 4.0G/52.4G
If possible, size your buffer pool to at least your active dataset. This will have a considerable impact on your initial insert speed.
> [!!] InnoDB buffer pool instances: 1
>From 5.6 (I think) this defaults to 8. The benefit is less contention for mutexes and the like. Upgrading to 5.6 is worthwile in most cases anyway.
> [!!] InnoDB Write buffer efficiency: 0.00% (0 hits/ 1 total)
Hmm. That's peculiar for an insert workload... did you run that after (or during) the workload?
Your original mail also doesn't seem to specify the workload beyond 'inserts'. Details?
Unhappiness is discouraged and will be corrected with kitten pictures.
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/mysql